tolong jawab yang c. dan d.

c. a = 20 + 60 = 80 derajat
d. 3x + 30 = 2x + 70
3x - 2x = 70 - 30
x = 40 derajat

c.) 20° + 60° = 80°

d.) 2X + 70 = 3X + 30
2X - 3X = 30 - 70
-X = -40
X = 40°